Method for preparing spherical chromium powder

A chromium powder and spherical technology is applied in the field of preparation of spherical chromium powder, which can solve the problems of high cost of spherical chromium powder, coarsening of chromium powder particles, etc., and achieve the effects of shortening production cycle, low porosity and short technological process.

Active Publication Date: 2014-10-01
SIRUI ADVANCED COPPER ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing technology for preparing spherical chromium powder is not mature, so that the cost of spheri

Method used

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  • Method for preparing spherical chromium powder
  • Method for preparing spherical chromium powder
  • Method for preparing spherical chromium powder

Examples

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Effect test

Embodiment 1

[0028] A preparation method for spherical chromium powder, comprising the following steps:

[0029] 1) Select the metal chromium block, remove the surface skin, oxide film and nitrogen film; then use the hydraulic coarse crusher with circulating water cooling device to mechanically crush the chromium block to make it into particles below 3mm;

[0030] 2) Utilizing the low-temperature brittleness of chromium, immerse metal chromium particles in liquid nitrogen, and perform low-temperature vibration grinding at the same time. The low-temperature vibration grinding is a vibration mill cylinder liner and The grinding body is carried out, and the time is 3 hours;

[0031] 3) Wash the metal chromium powder ground by low-temperature liquid nitrogen three times with ethanol, each dosage is 600ml, then use a vacuum system with Waterman #50 filter paper to filter, then in a vacuum oven, at 80 ° C, vacuum Dry at a low temperature of 94.5KPa for 5 hours until the moisture content drops b...

Embodiment 2

[0037] A preparation method for spherical chromium powder, comprising the following steps:

[0038] 1) Select the metal chromium block, remove the surface skin, oxide film and nitrogen film; then use the hydraulic coarse crusher with circulating water cooling device to mechanically crush the chromium block to make it into particles below 3mm;

[0039] 2) Utilizing the low-temperature brittleness of chromium, immerse metal chromium particles in liquid nitrogen, and carry out low-temperature vibration grinding at the same time. The low-temperature vibration grinding is a vibration mill cylinder lining and The grinding body is carried out, and the time is 5 hours;

[0040] 3) Wash the metal chromium powder ground by low-temperature liquid nitrogen three times with ethanol, each dosage is 500ml, then use a vacuum system with Waterman #50 filter paper to filter, then in a vacuum oven, at 80 ° C, vacuum Dry at a low temperature of 96.5KPa for 5 hours until the moisture content drop...

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Abstract

The invention discloses a method for preparing spherical chromium powder. The method includes the following steps that (1) a chromium metal block is selected and mechanically cracked; (2) by means of low temperature brittleness of chromium, chromium metal particles are soaked in liquid nitrogen and meanwhile, subjected to low-temperature vibration grinding; (3) chromium metal powder which is obtained after low-temperature liquid nitrogen grinding is washed for three times by ethyl alcohol, the ethyl alcohol is 500-600 ml each time, and then a vacuum system with filter paper is used for filtering; (4) dried chromium powder particles in the step (3) are placed in a high-energy ball grinding mill for ball milling; (5) a stable argon and carbon monoxide mixed plasma torch is established; (6) the chromium powder after ball milling in the step (4) is carried by argon and carbon monoxide mixed gas to be sprayed in the plasma torch by a feeding gun; (7) the chromium powder which enters the plasma torch is rapidly melted, cooled and solidified to enter a gas-solid separation chamber to be collected. According to the method for preparing the spherical chromium powder, a high-frequency induction coil is applied to the plasma torch, and the prepared spherical chromium powder is low in costs and high in rate of spheroidization.

Description

technical field [0001] The invention belongs to the field of powder metallurgy manufacturing, and in particular relates to a preparation method of spherical chromium powder. Background technique [0002] Metal chromium is the hardest metal, and normal chromium is brittle because it contains hydrogen or traces of oxides. High-purity chromium is not brittle, but malleable. Due to the high hardness of chromium, significant problems have been encountered in the process of preparing ultra-fine-grained high-purity chromium powder, that is, it is difficult to meet the requirements of both purity and particle size, or the processing time is long and processing higher cost. The size, shape and other components of chromium powder are the main factors affecting the properties of materials such as spray coating, superalloys, diamond tools, ferroalloys, solders, cermets, hard alloys, resistance heating alloys, and electrical contacts. At present, the chromium powder used in the produc...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F9/04
Inventor 杨平郭创立聂志林陈梅王小军张航杨承涛梁建斌武旭红王文斌
Owner SIRUI ADVANCED COPPER ALLOY CO LTD
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